Paint Calculation Formula
Wall Area = 2 × (length + width) × height
Subtract = doors × 20 sq ft + windows × 15 sq ft
Net Area = Wall Area − Subtractions
Gallons = (Net Area / coverage) × coats
Ceiling Area = length × width (if including ceiling)
Paint Coverage by Finish
| Finish | Coverage per Gallon | Best For |
|---|---|---|
| Flat / Matte | 400–450 sq ft | Ceilings, low-traffic walls |
| Eggshell | 350–400 sq ft | Living rooms, bedrooms |
| Satin | 350–400 sq ft | Kitchens, bathrooms, trim |
| Semi-Gloss | 300–350 sq ft | Trim, cabinets, doors |
| Gloss | 250–300 sq ft | Accent features, furniture |